F - Mech Eng,Light,Heat,Weapons – 25 – D
Patent
F - Mech Eng,Light,Heat,Weapons
25
D
F25D 29/00 (2006.01) F25D 23/02 (2006.01) F25D 17/06 (2006.01)
Patent
CA 2365745
A detection apparatus for detecting refrigerator door openings is coupled to at least one switch configured to be activated by a door opening. When the door is opened, the switch is activated and inputs a signal to the detection apparatus. The detection apparatus rectifies the signal; and phase-shifts the rectified signal so that it leads or lags the line voltage. The shifted output signal is fed to a processor that detects the opening of the door based upon the shifted signal. Signals output by a plurality of switches that generate a signal when activated mixed using an opto- coupler. Relative impedance of the lead and lag circuits may be adjusted to differentiate a phase shift of one shifted signal relative to another signal. The processor converts a value in degrees of phase shifting of the mixed signal to a time value, and based upon the time value, the processor determines which of the doors is open.
Bultman Robert M.
Herzog Rollie
Holmes John S.
Mathews Mark
Queen Jerry J. II
Company General Electric
Craig Wilson And Company
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